BS/EN 558-2017 pdf download.Industrial valves Face-to-face and centre-to-face dimensions of metal valves for use in flanged pipe systems PN and Class designated valves.
— Class 125; Class 150; Class 250; Class 300; Class 600; Class 900; Class 1 500; Class 2 500;
— DN 10; DN 15; DN 20; DN 25; DN 32; DN 40; DN 50; DN 65; DN 80; DN 100; DN 125; ON 150; DN 200; DN 250; ON 300; DN 350; DN 400; DN 450; ON 500; DN 600; DN 700; ON 750; DN 800; ON 900; ON 1 000; ON 1050; ON 1 200; ON 1 400; ON 1 600; ON 1 800; ON 2 000.
For valves in other shell materials than metal the same FTF and CTF dimensions may be used. For relationship between ON and NI’S see Annex 8.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 736-1, Valves – Terminology- Part 1: Definition of types of valves
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 736-1 and the following apply.
3.1
face-to-face dimensions
(FTF)
[straight pattern valves]
distance between the two planes perpendicular to the valve axis located at the extremities of the body end ports or as specified in the relevant valve product standard
Note ito entry: See Figures ito 4.
Note 2 to entry: In millimetres.
3.2
centre-to-face dimensions
(CTF)
[angle pattern valvesj
distance, between the plane located at the extremity of either body end port and perpendicular to its axis and the axis of the other body end port
Note 1 to entry: See Figures 1 to 4.
Note 2 to entry: In millimetres.
4 Dimensions and tolerances
4.1 Basic series
The basic series of FTF and CTF dimensions shall be as given in Table 2.
4.2 Face-to-face and centre-to-face dimensions
4.2.1 General
The FTF and CTF dimensions shall be in accordance with Figures 1 to 4 and Table 2.
For each type of valve, the basic series to be taken into consideration are given in Table 5 to Table 16.
NOTE I Table 2 gives complete series. In TableS to Table 16, the columns of series may be Incomplete.
NOTE 2 For certain sizes/types of valves, alternative dimensions are permitted and these are specified In
Table S to Table 16 as appropriate.
NOTE 3 The origin of the basic series Is shown In Annex A (Informative).
4.2.2 Class designated valves with ring joint flanges
For Class designated valves with ring joint flanges, the FTF or CTF dimensions given in Table 2 shall be increased by x as defined in Table 1 and Figure 5.
4.2.3 Valves with lining
For valves having a resilient lining which forms the gasket joint with the mating flanges, the FTP and CTF dimensions shall be the distance between the extremities of the valve in the installed condition. If the dimensions for CTF and FTF differ from the standard dimensions, they shall be given by the manufacturer.
For valves having a resilient or hard lining, the thickness of the lining on the mating surface shall be included in the FTF and CTP dimensions given in Table 2, unless the design of the valve precludes such an inclusion.
If this is the case, the manufacturer shall indicate the deviation from the standardized FTF or CTF dimensions in his documentation.
4.2.4 Raised face flanges
The raised face dimensions shall be in accordance with the applicable Ilange standard.
4.3 Tolerances
Tolerances on FTF and CTF dimensions are given in Table 3. Roth tolerances shall be fulfilled.
End flange seating surfaces shall be parallel or perpendicular. Tolerances ac” on the parallelism or perpendicularity as shown in Figure 6 are given in Table 4.BS/EN 558-2017 pdf download.

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